ive has my betta in a 5.5 gallon since feburary. the tanks been cycled awhile now i think because i havent gotten any ammonia or nitrites on my test kits- but i only get 5-10ppm nitrate. in march i had a problem with ick and edmund's fins fell off at the ends a little. hes all cured from ich but his fins never really grew back? and now ive noticed theyre gotten worse. it started with one pinehole but the holes become a tear down to the end of his bottom fin and today i noticed a new tear on his top fin. hes a doubletail, if that makes any difference for rot? and hes active and eats and everything. so whats wrong? what can i do to help?